Search

Recent studies suggest that longstanding findings of abnormal amygdala morphology in ASD may be related to symptoms of anxiety. To test this hypothesis, fifty-three children with ASD (mean age = 11.9) underwent structural MRI and were divided into subgroups to compare those with at least one anxiety disorder diagnosis (n = 29) to those without (n = 24) and to a typically developing control group (TDC; n = 37). Groups were matched on age and intellectual level. The ASD and anxiety group showed decreased right amygdala volume (controlled for total brain volume) relative to ASD without anxiety (p = 0.04) and TDCs (p = 0.068). Results suggest that youth with ASD and co-occurring anxiety have a distinct neurodevelopmental trajectory.

Autistic children experience high rates of anxiety. Insistence on sameness behaviour (IS) is a core feature of autism that appears correlated with anxiety severity. The objective of this study was to examine the longitudinal relations between anxiety and IS in autistic children using a developmental cascade model. A longitudinal cohort of 421 autistic children was followed between 4 and 11 years of age. Anxiety was quantified using items from the Anxiety Problems subscale of the Child Behavior Checklist; sameness behaviours were measured using the Repetitive Behavior Scale-Revised, Ritualistic/sameness subscale (both parent-report measures). Structural equation modelling was used to examine the longitudinal and directional associations between anxiety and IS at four time-points, through cross-lagged panel models (CLPM) with and without a random-intercepts component (RI-CLPM). Both the CLPM and the RI-CLPM had good fit. Significant directional associations were detected whereby elevated or increasing IS preceded elevated or increasing anxiety symptoms 1–2 years later, respectively. Stable baseline tendencies towards anxiety and IS as between-person traits (intercepts) were strongly associated (standardized estimate = 0.69, p < 0.001). The magnitude of the cross-sectional associations between anxiety and IS appeared to lessen with age. IS and anxiety symptoms in autism are closely related. They appear to be shared traits that mirror each other particularly in younger children. Increasing IS may be a sign of emerging future anxiety. Interventions that target IS to reduce or prevent anxiety amongst school-aged autistic children merit further study. [ABSTRACT FROM AUTHOR]

Objective: To evaluate improvement during the (a) cognitive and (b) exposure therapy phases of cognitive–behavioral therapy (CBT) for autistic youth with anxiety disorders. Method: Participants were 148 autistic youth (aged 7–13; 77% male; 64% White) with clinically significant anxiety who were randomized to standard or adapted CBT. Clinician-rated anxiety severity was recorded at each appointment. Trajectories of change during (a) the cognitive phase and (b) the exposure phase of treatment were analyzed using piecewise multilevel modeling. Results: Compared to the psychoeducation and cognitive therapy phases, the exposure phase corresponded with significantly more rapid symptom reduction, b = −.11, 95% CI [−.13, −.071]. This finding was true for standard CBT, which included nine sessions prior to exposure initiation (on average), as well as for CBT personalized for autistic youth, which introduced exposure following the fifth session (on average). In contrast, compared with improvements during initial psychoeducation sessions, the introduction of cognitive skills corresponded with significantly slower symptom reduction, b =.066, 95% CI [.020,.11]. This finding was also true for both adapted and standard CBT. Conclusions: Results underscore the central role of exposure in the treatment of anxiety among autistic youth and question the utility of cognitive strategies without subsequent practice of these skills during exposure. Assuming a working relationship, therapists should consider moving through the preexposure coping phase of CBT quickly. Future research should evaluate the extent to which exposure can maintain its potency while minimizing coping skill preparation. What is the public health significance of this article?: Clinically significant anxiety is highly prevalent and causes substantial functional impairment in autistic youth. This study identified an acceleration of improvement during the exposure therapy phase of cognitive–behavioral therapy and minimal change during the cognitive portion. This finding was the case in a protocol that introduced exposure after the fifth session and in a protocol that introduced exposure after the ninth session, suggesting that introducing exposure earlier in treatment has the potential to enhance the efficiency and efficacy of treatment. [ABSTRACT FROM AUTHOR]